Chamber dimensions have a bit to do with brass life. If you have a chamber that is cut close to SAAMI Max dimensions, resizing works the brass a lot more than a chamber cut to SAAMI min specs. The latter will be much easier on brass, given equal pressures. I do not normally hunt with brass that has been reloaded more than 5-6 times, but I also have some 6mm Remington [ W-W] brass that is on it's 25th reload. The point a fellow poster made about primer pockets is very valid. If primers are starting to seat very easily, it is time to retire that brass. I don't know if my experience in this is unique, but it seems that Federal brass tends to loosen primer pockets quicker than any other brass I have used. In domestic brass choices, I do prefer Winchester, but in some chamberings, it is unavailable, so will go to Remington if they make it. I do like Lapua brass, but choices are limited. Regards, Eagleye.